Gauge



G. H. ALLEN GAUGE July 17, lffs, '1,677,424

s Filed MaylO, 1925 da zwi,

BY l

ATToRNE Patented July 17, 19278..

GERALD H. ALLEN, oF nn'rnon MIGHIGAN.

GAUGE.

Appucation'meamay 2o, 1925. serial' No. 31,693.

.The present inventionrelates to gauges and specifically tooneparticularly adapted for the setting of the gap between the rotoryandstator of Ford or '.F ordson magnetos and the individual magnetfacesfon the Hywheel rotor. *1 Y l A "In the Ford and Fordson magnetos,the stator consists of an annular framel carrying the cores and windingsconstituting the armature of theY magneto and this frame is providedwith aflange by means of which it is secured to the upper part of. thecrankcase of the engine. The rotorA carrylng per-y manentfmagnets issecuredlto the rear end of the engine crank shaft and lconstitutestheflywheel. Attached to the Hywheel rotor is thetransmission andthesetogether form a unit'which is bulky and 'difhcult tol handle.

Heretofore,jit has been customary to attach the v stator to the crankcase, then attach the rotor unit to the crank shaft and if the gapbetween stator and rotor did not happen to, be correct, as is the usualcase, the rotor and stator had to be both dismounted and shims put in ortaken out in order to spacev them properly. v

The presentpinvention is intended to ob viatethis extra handling and hasfor one of itsobjects al gauge by means of which the relativelocation ofthe stator and rotor can be accurately and easily determined before theyare assembled togethen yAnother ob'ect is a gauge by means of whichthepole faces ofthe rotor can with the least diiiiculty bel accurately setto parallelism and in the same plane.

YThe invention will be;l more easily described4 and understood byreferring'to the accompanying drawing in which- Fig. 1 shows a partialvertical section of v the gauge-attached the rotor ofthe mag- -Fig. 2is, any elevation of the gaugebeing used linv connection with thestator.

Fig. 3 is a plan of the gauge itself.

As'indicated in the drawings, the gauge consists of ay standardindicated as a whole by the numerall 5. This standard is made of a basemember 6 `supporting a bearing pinv extending upward from its centrallportion. Mounted on top of the bearing pin is an upper face member 8 ofsubstantially the same size as the base member 6, but provided withe`ars8a lhaving threaded holes 8b. Member 8 will also be provided withother threaded holes 9 near its edgesyall of which `holes and :betweenthe outer servev for the securing V'of vstuds l0 whereby said member maybe secured in proper position `relative to the stato/ref a Fordson orFord magneto. Member 6 is provided with two notches 9 serving for thepassage ofthe two dowels Elli-found upon a Ford'rotor and. serving tolocate the gauge. Member 6`is alsoprovided-with four other' andshallower notches 9c 'which together with notches 9% fit over the sixstuds found *Ona Fordson rotor and serve to locate the gauge withrespect-thereto. c 'i Adapted to rotate'ina plane vparallel with facesof the parts' and 8 upon thebearingpini 7 is an arm 15.

l.Thisv arm` is' lof approximately the samev length as the radius of themagneto'assernbly and carries at its outer end in a tapered hole athreaded bolt 16 set perpendicular to the vfor the purposeof locking thescrew 18 in adjusted position." Beand is provided at one plane ofrotation of the arm 15. The bolt l hardened. `There lwill bored*A andtapped cenfore leaving the factory the boltY 16 lwill bc accurately setby use Vof yscrew 18 and nut 19 So that its overall length Vwill be'.030 .of an inch greater than the Vdistance between the outer facesofmembers 6 and .8; The,.bolt 16 Vwill ,also be rprovided'. with a:knurled flange 20 a'shortdistanc'ey from 'its upperV end by-.mea'ns ofwhich it vmay be screwed. up and down in the tapped'hole in theend ofarm 15, a knurled-nut 21V beingl used Yon one side of the arm for thepurposev of se# curing the bolt 16 in vertically adjusted position. j vl Inproducing the gauge, theimembers 6y and 8 will have ltheir Youterfaces ground accurately parallel and perpendicular to the axis ofbearing pin 7. The bearingpin 7 will also be surfaced so as to give asmooth bearing surface for the arml. Further, the

upper and lower faces of thebearing end of arm 15 will be provided withsmooth bearing surfaces and thewhole assembly so construct-v ed that thearm 15 will move aboutvthe bearing pin with vno noticeable'verticalplay, and the assembly will be held together by means of a bolt 25bearing pin as indicated in Fig. 1.

. passing axially throughV the y to the thickness of the shims thatshouldbe l In using the gauge above described, it is first secured invplace upon the magneto rotor 3011s indicated in Fig. 1. The base member6 of the gauge is set over or between the dowels rovided in the recessin the flywheel shaft flange. When the gauge has been put' in positionas indicated the boltlis adjustl ed vertically so that the "end 17 ofthe bolt just touches the Ylowest, pole face of the rotor. Theparmglisthen rotated about the standard and1 each ofy the pole faces is inturn adjusted .until all are 1n the same plane as f e` gaugeowillthe'lowest one and until the end 17 of .the bolt'lti will touch eachone. been done the bolt 16 will be secured in its ad'usted positionbyineans ofV nut 21.

l I then bevk secured to the flange 3 1 of the engine crankshaftasindi.- cated in Fig. 2, in reversed position when compared withFig. 1. This will bring the endr18. of bolt 16 into co-operativerelation VQ with-the stator member 35Y of the magneto.

' Ying the upper This stator member 35 is constructed and Varranged tobe secured to the casting 36 (aV portion only of which is beingl shown)formi half of the engine crank case and its adjustmentto and from therotor ifthe stator is mount thestator without any s padding with shortshims or pieces atv member hasto accomplished by the; useof shimsbetween the twoparts y35 and 36. When the gauge ,isinposition as in Fig.2 and the stator 35 secured to the crank case, l in proper relativeposition with respect to the flywheel rotor, the end 18 of bOlt 16 willjust touch all of the core endsl of the stator. VThe usual ractice isyto ims between its Vflange and. the crank case and whenv this is` done,the space between the end of the gaugeand the facesof the core ends isequal behind the stator'` flange, the space being me sured by usingtheshims themselves aS.

this `is readily vdeterof `easily by the Vlnined and can bel taken careenthese several adjustments just mentioned have been made so that ,thepole faces o onthe rotor and the core ends on the stator all just touchthe ends of the bolt 16 with the auge secured in proper position, itwill be o-und that, when the parts are assembled, the rotor will beaccurately positioned with its pole faces at the properdistance from Asthe bolt 16 lis aca length'of` .030 of an parallel outerv facespofmembers L6 and 8,

. the magnetogap will be accurately .030 of an inch. VThis distancehasbeen determined to. be Vthebest for the most etlicient operationofthe magneto. Y v

' It should be noted that theinvention is When this has` f spiritof theinvention but is only to be limit- Y, `ed bythe scope of the claimswhich follow. rotor a apted for the reception of crank Y Clalmsz V'1. Agap gauge comprising a standard vhaving upper and lower parallel facesadapted to contact with the faces to be gauged, an ar1ncXtendingfromsaid standard, said arm carrying afpin substantially perpendicular tothe planes of said parallel faces, which pin exceeds in length thedistance between said parallel faces by a predetermined amount.; A 2. Agauge comprising a standard having lowerv and upper faces. ofcomparatively large. area. and accuratelyparallel .and a bearin pinbetween the Jfaces and perpendicular t creto, and an arm adapted torotate v about said pin, said pin passing through one end of said arm,Vsaid arm carrying atvits Y other end an adjustable gaugeY bolt whosevroverall lengthexceeds ,the distance between said faces by, an accurately1 predetermined amount. V 1 '3. A- gap gaugeco1npri.sing a standardhaving lowerand upper faces Ofcomparatively large area and accuratelyparallel and a bearing pin between the facesvand *per-x pendicularthereto, and an'arm adapted ,to 95 rotate about said pin, said pinvpassing through one end of saidarm,` said arm ,carry- Q ing yat itsother end an adjustable gauge bolt whose overall length exceeds theVdistance between said faces by the required measure- 100 ment of saidgap..

4. A gap'` gauge for-.Ford and 'Fordson magnetosy consisting of a,standard having accurately parallel plane alower; land upper faces'adaptedto be secured either :to the 105 flange of a Ford or Ford'soncrank shaft or to a `Fordor Fordson flywheel, an arm rotatable aboutsaid standardaparallel to and between the planes of the ,said yfaces andhaving one end at the standard, anda gauge 11u bolt adjustableperpendicularly to said planes A in the outer end ofi-said arm.

5. A gap/gauge for Ford. and Fordsou magnetos consisting of a. standardhaving accurately kparallel plane lower and upper faces provided withmeans for securing said faces either to the flange of a Ford or Fordsoncrank shaft or toa Ford or Fordson flyfwhcel, an arm rotatable aboutsaidstandard parallel to and between the planes of the 12o said facesand having one end, at the standard,. and .a gauge bolt adjustableperpendicularly to said planes in the outer end of'said arm,jsaid boltbeing of an overalllength accurately .O30 of an inchgreater V'than the125, distance between said faces.

6. A gap gaugeyfor Ford and Fordson magnetos consisting of a standardhaving accurately parallel4 plane lower and. upper faces,v the latteradapted to be secured to 4the 13u flange on a Ford or Fordson crankshaft and the former provided with means for securing to a Ford orFordson flywheel, an arm rotatable about said standard parallel to andbetween the planes of the said faces and having one end at the standard,and a gauge bolt adjustable perpendicularly to said planes in the outerend of said arm, said bolt being of nonmagnetic material provided withhardened steel ends.

7. A gap gauge for. Ford magnetos consisting of a standard havingaccurately parallel plane lower and l.upper faces, the

vtatable aboutsaid standard parallel to and between the planes of thesaidfaces and having one end at the standard, and av gauge boltadjustable perpendicularly lto said` .Y planes in the outerend of saidarm, said lbolt being of non-magnetic material provided with hardenedsteel ends and being provided with means for adjusting its length.

GERALD H. ALLEN.

